Skip to content

How to Read ROS Documentation

Understanding ROS documentation is key to working efficiently with robotics software. Here are some tips and examples to help you get started:

Reading Topics and Messages

  • ROS nodes communicate using messages sent over topics. Each topic has a specific message type, which defines the data structure.
  • Message types are defined using a simple, language-agnostic syntax. They can include integers, floats, arrays, and more.
  • To understand a topic, look up its message type in the documentation. For example:
  • sensor_msgs/PointField message

How to Interpret Message Definitions

  • Each message page lists the fields, their types, and descriptions.
  • Example fields: int32, float64, string, array.
  • Messages can be nested (contain other message types).

Reading API Documentation

  • ROS documentation often includes Python and C++ API references for each package.
  • Look for usage examples, function signatures, and parameter descriptions.
  • The docs.ros.org site is the main hub for official documentation.

Tips for Beginners

  • Start with tutorials and overview pages before diving into API details.
  • Use example code to see how messages and topics are used in practice.
  • If you’re stuck, search for guides, blog posts, or video tutorials (e.g., YouTube: "All you need to know about ROS Messages").

If you find something confusing, help improve the docs by submitting a pull request!